Make sure that you use "/nick <Your Yahoo ID>" to set your nickname!
People leaving their nickname as NSLU2-IRC will be ignored ...
[Note that this interface will not work behind a firewall which does not allow IRC connections - this is a Java IRC client which runs on your client machine, it is not a Web->IRC gateway.]
To manually connect in an IRC client:
/server irc.freenode.net /join #nslu2-general
/server irc.freenode.net /join #nslu2-linux